Necklace of Memory Enhancement

The wearer of this necklace gains two benefits.
1. Immune to all memory loss, from both natural and magical causes. The necklace has no effect on a wizard's spell memorization.
2. The wearer can recall with absolute clarity any sight or conversation he experienced or any book he read within the previous seven days. Memories prior to seven days ago are recalled with only normal clarity. The necklace affects only events that occurred while the necklace was worn by the user.